Engine sensor faults

[Zzz!!]

I've just replaced the timing belt on my sons Ibiza 1.2 12valve after the last one jumped and bent the inlet vales. When we started it it ticks over great and sounds better than ever before. The problem is when the engine is revved over 3000 rpm is starts to cut out the restart. If the throttle is held steady it will rev between 3000 and 2500 on it own. Its as if its going into limp mode then coming out again.
Checking with my VCDS I get the following errors.


Address 01: Engine Labels: Redir Fail!
Part No: 03E 906 033 P
Component: 1,2l/4V SIMOS3 00HS5328
Coding: 00071
Shop #: WSC 06402
VCID: 2D51D485E702F670BBD
VSSZZZ6LZ4R213056 SEZ7Z0D2500493

4 Faults Found:
16725 - Camshaft Position Sensor (G40)
P0341 - 35-10 - Implausible Signal - Intermittent
17526 - Oxygen (Lambda) Sensor Heating; B1 S2
P1118 - 35-00 - Open Circuit
17952 - Angle Sensor 1 for Throttle Actuator (G187)
P1544 - 35-10 - Signal too Large - Intermittent
17580 - Angle Sensor 2 for Throttle Actuator (G188) Signal too Low
P1172 - 35-10 - - Intermittent
Readiness: 1110 0101


There was no problem like this before the timing chain jumping.
Does anyone know if there is a common supply or earth that could generate this problem. Is it possible I've disturbed something removing the head etc, to create a common fault.

Thanks

 

[Seatmann]

You might to do something with vcds for the throttle, I think if the battery has been disconnected or whatever then it needs reset. I don't know how you do it though. I suspect that might be the one causing the running problems.

Did you try clearing the codes too? It could be that some of them were there before the damage.

 

[Zzz!!]

Ive ran the throttle body alignment on VCDS but the problem is still there. It just will not rev past 3000rpm. I think I'll take the throttle body apart and clean it all up then try again.

 

[Zzz!!]

I removed the throttle body and removed a good build up of carbon from the under side. Refitted and ran the alignment tool again. Good news is that now the faults for the throttle have cleared but the engine is still doing the same thing. With the throttle held steady it will not rev over 3000 rpm. The only fault showing now is


16725 - Camshaft Position Sensor (G40)
PO341 - 35-00 - Implausible Signal

I guess this means the Cam sensor is knackered but would it cause the revving issue.

 

[Zzz!!]

New cam sensor fitted but fault still exists.
Must be a wiring issue.

 

[Seatmann]

It's not bent at all? Like where the sensor bolts to or that? I'm not up to scratch on the petrols at all unfortunately. You might find some info on the home page under ibiza, there's usually a faq in there.

 

[Zzz!!]

Wiring checked and theres continuity from the ECU to the plug on all wires. Tested at the plug and with the ignition on there is 5 volts on wires 2 & 3. Also just noticed that the new sensor is slightly magnetic where the old one isn't ???

 

[Zzz!!]

No, nothing seems to be bent.

 

[Seatmann]

If you clear the faults do they all come straight back after running the engine?

 

[Zzz!!]

Yes, cam sensor fault comes back straight away.

 

[Zzz!!]

I've checked the timing again just to satisfy myself that there is no problem with it. The locking pins all went straight into the flywheel and cams with no problem so I'm happy that nothing has moved. I've disconnected every connector I can find and cleaned the contacts then put them back together with a squirt of WD40. I've cleaned the battery terminals and disconnected the ECU. And I still have the same fault and engine limited to 3000rpm.
If I had hair I'd be tearing it out.

 

[Zzz!!]

Can anyone post a picture of the cam position sensor pick up or reluctor to I can compare it to mine. I've had the timing cover off again today and double checked the timing and all is still OK.
The car starts first time every time and runs great up to 3000 revs. With the throttle held steady it just drops to about 2700 then back to 3000 all the time.

 

[Seatmann]

Check this, it's on about the possibility of the wiring being to close to like the spark plug leads or that and it causing interference.

http://www.permoveo.ltd.uk/tabid/122/OBD-Error-Code/P0341/Diagnostics/Seat/Default.aspx

I'm googling just now lol

 

[Zzz!!]

Yes I did read that. None of the wiring has changed but I will try and separate the harness to take the sensor wires away from the coil pack wiring. The only other thing I have done recently is change the plugs and the coil packs. I intend to change the coils packs (or 2 of them) to see if they are causing interference.

 

[Zzz!!]

Changed coil packs over tonight and still no difference.

 

[Seatmann]

But the cam sensor fault still remains? It makes some sort of sense that when you rev up the ecu is losing track of the timing so cuts something until the revs drop where it then regains the timing.

It's a hell of a hassle you're having after just replacing the timing belt.

Only other thing I can think of is an ecu fault but why it would start this after a timing belt change I don't know.

One thing you might as well try seeing as there's nothing to lose is to disconnect the battery leads and touch them together for 30 seconds or so, I don't know why but somehow this is supposed to discharge anything left in the ecu and has been known to cure weird faults.

 

[Zzz!!]

I tried connecting the 2 leads together. I actually left it for an hour or so but the problem is still there. What is also unusual is that the engine management light isn't always coming on. I've read that some people having similar problems have been tracing it to a brake light switch fault ???? I'm going to have to bite the bullet and take the car to get it looked at. There are a couple of independent VAG specialist local to me so I'll visit one them.

 

[Zzz!!]

The car has now been in a local VAG specialist for 3 days and they cant find the fault.
They have checked and re done the timing chain twice and the car is still giving the same fault. They also checked the wiring from the cam sensor to the ECU - all of which I've already done. I've now ordered a replacement ECU off eBay to try. If that's not the problem my son will be limited to 3000 rpm forever!!!

 

[Seatmann]

Well it's a strange one that's for sure.

 

[crazyquiff]

Hi - I have the exact same problem - did you solve it in the end?